Data Sheet

5 Module power-on timing requirements
below 0.6V, the module will probably crash when it is restarted. It is required that
the power supply pin VCC_3.3V of the module needs to be connected with a dummy
load of 1K to release power quickly. You can refer to the following 󰍓gure which shows
parts of power-driven links.
As the voltage back󰍔ow occurs when interfaces of the module are connected to
others, you can pull down the CEN or RST pin, to reduce the power consumption
when the module doesn’t work.
As shown above, the MCU controls the CEN or RST pin through the GPIO interface,
so as to power on or o󰍒 the module. When there’re data to report, the GPIO inter-
face outputs the high level, the module is powered on, the serial communication is
established, and the MCU synchronizes the data to the Cloud and client end. After
reporting the data, the GPIO interface outputs the low level, the module is in reset
state, and the module consumes little power. Disadvantages: There is a 10-K pull-
up resistor in the CEN or RST pin. When the module is in reset state, there is still an
input current of 330uA.
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